Electrical apparatus.



K. G. RANDALL. ELECTRICAL APPARATUS. APPLICATION FILED APR. 5. 1907.-

Patented Dec. 8, 1908.

- economical of space and that KARL U. RANDALL, OF EDGE-WOOD PARK, PENNSYLVANIA,

ELECTRIC & MANUFACTURING COMPANY, A

ASSIGNOR TO WESTINGHOUSE CORPORATION OF PENNSYLVANIA.

ELECTRICAL APPARATUS.

Specification'of Letters Patent.

Patented Dec. 8, 1908.

Application filed April 6, 1907. Serial No. 366,505.

To all whom it may concern:

Be it known that I, KARL O. RANDALL, a citizen of the United States, and a resident of Edgewood Park, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Electrical Apparatus, of which the following is a specification.

My invention relates to the protection and disposition of electrical apparatus and it has for its object to provide an improved means for the protection of electrical apparatus from the weather and mechanical injury that shall be specially simple, portable and shall involve the useof a minimum number of insulating bushings. I V,

Electric transformers are often disposed in tanks or cases which serve as a protective means and which contain oil or other insulating fluid adapted both for cooling and for insulating the coils. In service, it is usually necessary to provide bushings of porcelain or similar material through wh-icli' conductors extend for transmitting the energy to and from the transformer. Similar insulators, housings and protected leads are employed in connection with circuit interrupters and protective devices on relatively high voltage circuits and they are usually provided at considerable expense.

According to my present invention, I locate atransformer, a circuit interrupter, and a choke coil or other protective device'in a single tank or casing which contains insulating fluid, such as oil or air, and, in this way, I materially reduce the number of insulating bushings and housings required for the system.

Figure 1, of the accompanying drawings, is a diagrammatic view of a system of ele trical distribution, the elcments of which are divided into groups which are disposed in single tanks in accordance with my invention, and Fig. 2 is a diagram of the circuit connections of the system of Fig. 1.

Referring to the drawings, the system illustrated comprises an alternating current generator 1, transformers 2 having primary windings 3 and secondary windings 4, circuit interrupters 5 and choke coils 6. The primary windings 3 are supplied with energy from the generator 1 through line con; ductors 7,.8j'and 9, choke coils 6 and circuit interrupters 5, a well known star connection voltage insulating I being eifected by interconnecting the opposite ends of the primary windings as here inafter explained.

The transformers, circuit interrupters and choke coils are divided into groups and are .10 disposed in fluid-containing tanks or cases 10 one of which is shown in section to dis close the apparatus therein. The cases 10 may be made of boiler iron or other con ducting material and, as illustrated, are pro vided with closely fifting covers 11 in which insulating bushings 12 and 13 are supported, the secondary coils at being connected to some translating device, as a motor 1st, by leads which extend through the bushings 13- and the generator conductors being insulatcd from the covers by the bushings 12. The neutral points of the windings are established by connecting the free ends of the primary and secondary coils to the tanks 10 75. which in turn are interconnected by conductors l5.

It will be observed that a single highbushing is required for each transformer and that this bushing also serves for insulating the leads of the choke coil and circuit interrupter which ordinarily would be provided with two or more insulating bushings of this character. The cir cuit inierrupters maybe of any wellknown type, either manually or automatically operated and, as illustrated, each comprises stationary contact members 16, a movable contact member 17, an operating handle 1-8, connecting links 19, a tripping coil ZO'and a latch 21.

Referring ymrticularly to Fig. 2, a threephase generator 1 supplies energy to the star-connected primary winding of a transformer 2, the star-connected secondary windas ing of which is connected to a motor 14-. The three legs of the transformer may be dis posed in separate tanks as shown in Fig. 1 or the entire device. with the necessary switching and protective apparatus, may be inclosed in a single tank.

it will bereadily understood that my invention is not restricted in its use to the. arrangement shown and that a material saving in space and expense will be effected by disposing in a single tank a transformer and either one or both of the protective and switching devices shown in the drawings, since a single set of bushings is required instead of several sets.

I plaim as my invention 15- The combination with a fluid-containing tank, of a transformer and a circuit interr'upter located in thetankf 2. The combination With a transformer and a fluid-containing casing therefor, of a circuit interrupter for the transformer also located in said casing.

- 3. The combination with a transformer, an automatic circuit interrupter and a protective device, of a single fluid-containing casing for said devices.

4. in an electrical apparatus, the combination with a plurality of electrically con nected devices, of a single fluid-containing casing therefor.

5. The combination with a transformer, a circuit interrupter, and a protective device, of a fluid-containing tank orcasing, insulating bushings supported in the .Walls 'of the tank, line conductors which pass 1 through the bushings and interconnect the device withinthe tank, and means for seal-' ing the tank. K

'6. The combination With a transformer,

subscribed my name this 2nd day of :April, I907.

KARL C. RANDALL.

Witnesses FRANK CONRAD, BIRNEY HINEs.

In testimony whereof, I have hereunto a circuit interrupter, and a choke coil, of a 

